package com.konka.imagefilter.api;

import android.graphics.Bitmap;
import android.graphics.Color;
import android.util.Log;

public class OldFilter {
	// 怀旧效果函数
	public static Bitmap changeToOld(Bitmap bitmap) {

		int width = bitmap.getWidth();
		int height = bitmap.getHeight();
		Log.i("OldFilter", "width=" + width + "; height=" + height);
		Bitmap returnBitmap = Bitmap.createBitmap(width, height,
				Bitmap.Config.RGB_565);
		int pixColor = 0;
		int pixR = 0;
		int pixG = 0;
		int pixB = 0;
		int newR = 0;
		int newG = 0;
		int newB = 0;
		int[] pixels = new int[width * height];
		bitmap.getPixels(pixels, 0, width, 0, 0, width, height);
		for (int i = 0; i < height; i++) {
			for (int k = 0; k < width; k++) {
				pixColor = pixels[width * i + k];
				pixR = Color.red(pixColor);
				pixG = Color.green(pixColor);
				pixB = Color.blue(pixColor);
				newR = (int) (0.393 * pixR + 0.769 * pixG + 0.189 * pixB);
				newG = (int) (0.349 * pixR + 0.686 * pixG + 0.168 * pixB);
				newB = (int) (0.272 * pixR + 0.534 * pixG + 0.131 * pixB);
				int newColor = Color.argb(255, newR > 255 ? 255 : newR,
						newG > 255 ? 255 : newG, newB > 255 ? 255 : newB);
				pixels[width * i + k] = newColor;
			}
		}

		returnBitmap.setPixels(pixels, 0, width, 0, 0, width, height);
		return returnBitmap;
	}
}
